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                Selling Tickets                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p>厨师在一次晚宴上准备了n道丰盛的菜肴，来自世界各地的m位顾客想要购买宴会的门票。每一位顾客都有两道特别喜爱的菜，而只要吃到了至少一道他喜爱的菜，这位顾客就会感到很高兴。当然，每道菜最多只能供应给一位顾客。厨师想要卖出尽可能多的门票，但同时要能够保证，无论哪些顾客购买门票，所有到来的顾客都能感到高兴。现在，厨师想要问你，他最多能够卖多少门票？</p></p><hr/><h3>输入格式</h3><p><p>输入的第一行包含一个正整数T，表示数据组数。<br />
对于每组数据，第一行包含一对整数n和m，分别表示菜肴的数量与顾客的数量。接下来m行，第i行的两个正整数Ai, Bi代表第i位顾客喜爱的两道菜的编号。相邻的两组数据之间用一个空行分隔。</p></p><hr/><h3>输出格式</h3><p><p>输出总共T行，对于每组数据，输出一个整数，表示厨师最多能售出的门票数。</p></p><hr/><h3>样例输入</h3><pre>3
6 4
1 2
1 2
3 4
5 6

6 5
1 2
1 2
1 2
3 4
5 6

4 5
1 2
1 3
1 4
2 3
3 4</pre><hr/><h3>样例输出</h3><pre>4
2
4</pre><hr/><h3>提示</h3><p><p>对于第二组数据，厨师不能卖3张门票。因为如果顾客1, 2, 3购买门票，厨师是不可能用菜肴1, 2满足三个顾客的要求的。<br />
<br />
【数据规模与约定】<br />
1&le;T&le;15,&nbsp;&nbsp; 2&le;n&le;200,&nbsp;&nbsp; 0&le;m&le;500<br />
1&le;Ai, Bi&le;n且Ai&ne;Bi</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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